[UPDATE1] An Iranian Arab dissident group claimed Muqtada al-Sadr and a large contingent of his lieutenants are in Khuzestan, under the protection of Iranian troops. KUNA reports a joint US-Iraqi force has raided a Sadr office in Baghdad. A suicide bomber attacked a police checkpoint in Sadr City, killing 13. The British drawdown in southern Iraq has actually been planned since last summer. A Blackhawk helo made a hard landing north of Baghdad, but no injuries were reported.